Enable goxdcr manually until made available in product

Change-Id: I83156a00aa82df9061ad749c3f7920cf18a04465
Reviewed-on: http://review.couchbase.org/44364
Reviewed-by: Aruna Piravi <aruna@couchbase.com>
Tested-by: Aruna Piravi <aruna@couchbase.com>